Solar Physics

, Volume 238, Issue 2, pp 293–312 | Cite as

Companion Event and Precursor of the X17 Flare on 28 October 2003

  • C. H. MandriniEmail author
  • P. Demoulin
  • B. Schmieder
  • E. E. Deluca
  • E. Pariat
  • W. Uddin
Open Access


A major two-ribbon X17 flare occurred on 28 October 2003, starting at 11:01 UT in active region NOAA 10486. This flare was accompanied by the eruption of a filament and by one of the fastest halo coronal mass ejections registered during the October–November 2003 strong activity period. We focus on the analysis of magnetic field (SOHO/MDI), chromospheric (NainiTal observatory and TRACE), and coronal (TRACE) data obtained before and during the 28 October event. By combining our data analysis with a model of the coronal magnetic field, we concentrate on the study of two events starting before the main flare. One of these events, evident in TRACE images around one hour prior to the main flare, involves a localized magnetic reconnection process associated with the presence of a coronal magnetic null point. This event extends as long as the major flare and we conclude that it is independent from it. A second event, visible in Hα and TRACE images, simultaneous with the previous one, involves a large-scale quadrupolar reconnection process that contributes to decrease the magnetic field tension in the overlaying field configuration; this allows the filament to erupt in a way similar to that proposed by the breakout model, but with magnetic reconnection occurring at Quasi-Separatrix Layers (QSLs) rather than at a magnetic null point.


Solar Phys Magnetic Reconnection Null Point Reconnection Process Trace Image 
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Supplementary material

Supplementary material (1.91 MB)

1600-evol.avi (18.3 mb)
Supplementary material (18.2 MB)
195-evol.avi (20.3 mb)
Supplementary material (20.2 MB)


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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • C. H. Mandrini
    • 1
    Email author
  • P. Demoulin
    • 2
  • B. Schmieder
    • 2
  • E. E. Deluca
    • 3
  • E. Pariat
    • 2
  • W. Uddin
    • 4
  1. 1.Instituto de Astronomía y Física del Espacio (IAFE)CONICET-UBABuenos AiresArgentina
  2. 2.Observatoire de Paris, LESIA, FRE 2461 (CNRS)Meudon Principal CedexFrance
  3. 3.Smithsonian Astrophysical Observatory (SAO)CambridgeU.S.A.
  4. 4.Aryabhatta Research Institute of Observational Sciences (ARIES)NainiTalIndia

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